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d in (-oo:+oo)
-24 = 7*d+2*d+3 // - 7*d+2*d+3
-(7*d)-(2*d)-24-3 = 0
-7*d-2*d-24-3 = 0
-9*d-27 = 0 // + 27
-9*d = 27 // : -9
d = 27/(-9)
d = -3
d = -3
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